I'd like to hear what others have found works well for concert grand "spider" casters. We have several sets in need of replacement and have seen different types of casters in use on these. One is a hard rubber, allowing for ease in rolling, another is more soft, requiring more pushing power, but ends up staying where you put it!! I believe Colson makes the hard rubber one. Thanks for all suggestions, and experiences. John Minor Piano Technician University of Illinois jminor@uiuc.edu
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